I played the game for quite a long time without knowing about the crafting as well. Then there was a period that I knew crafted items existed, very seldom would I see them, but I knew of them. I didn't actually realize the recipes and what possibilities were out there for years. The book that came with the game was way outdated when I started in 1.09.
I also followed some people I met online into Classic Diablo in 1.10 and I only had like half of an understanding of what the GG rares vs the Okay or Decent rares were. I didn't bother to learn all the max numbers and had trouble knowing if rares I found were good. That was awhile ago. Since then, I'll see people posting questions asking if things are good for LLD, MLD or are good rare items and can't believe I used to be that person lol.
I also remember seeing IK Maul shortly after I first started playing in 1.09 and thought it was this Godly item, with such absurdly high damage numbers, a set item, huge maul and something that had to be such a super great item in the game. I hadn't yet discovered that cruel weapons of quickness/evisceration/etc or Fury Runeword or Grandfather or a few other items were infinitely better than an IK Maul, especially by itself.